[英]Using Capistrano to deploy a Rails application to multiple web servers
I'm currently setting up a new production environment for a Rails application which includes multiple, load-balanced application servers (currently only two, but this will increase over time). 我目前正在为Rails应用程序设置一个新的生产环境,该应用程序包括多个负载均衡的应用程序服务器(目前只有两个,但随着时间的推移会增加)。
I'd like to handle deployment of the app to all these servers in a single command using Capistrano (which I already use for my existing, single server). 我想使用Capistrano(我已经用于现有的单个服务器)在单个命令中处理应用程序到所有这些服务器的部署。 The only way I can see of doing this is to use
capistrano-ext
(which I actually already use to deploy to my test and staging environments), by defining a new 'environment' for each application server ( app1
, app2
and so on) and performing a deployment using something like: 我能看到这样做的唯一方法是使用
capistrano-ext
(我实际上已经用它来部署到我的测试和登台环境),为每个应用服务器( app1
, app2
等)定义一个新的“环境”并使用以下内容执行部署:
cap app1 app2 app3 deploy
Is this the recommended way of doing it or is there a better approach? 这是推荐的做法还是有更好的方法?
Assuming capistrano multistage : 假设capistrano多级 :
In config/deploy/production
: 在
config/deploy/production
:
role :app, "server1", "server2", "server3"
Now a cap deploy production
will deploy to all 3 servers. 现在,
cap deploy production
将部署到所有3台服务器。
Yeah. 是啊。 Capistrano manages multiple servers natively.
Capistrano本地管理多个服务器。 No need for capistrano ext.
不需要capistrano分机。
You only need to define multiple roles 您只需要定义多个角色
role :app, "myserver.example.com"
role :db, "mysecondserver.example.com"
By default your tasks will be executed on every server. 默认情况下,您的任务将在每台服务器上执行。 But you can limit a task to one or some servers only.
但您可以将任务限制为仅限一个或一些服务器。
task :migrate, :roles => [:app, :db] do
# ...
end
Here, the task will be executed only on the app and db roles. 此处,任务仅在app和db角色上执行。
You can do the same with the run method. 您可以使用run方法执行相同的操作。
run "rake db:migrate", :roles => :db
The rake db:migrate will be run only on the db server. rake db:migrate将仅在db服务器上运行。
This is what I have tried in rails 4
: 这是我在
rails 4
尝试过的:
config/deploy.rb: 配置/ deploy.rb:
role :app, %w{server1 server2 server3}
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